Sorry to hear you lost your mother. I lost mine June 2005. Mom was 90, very active, loved to sing, talk about politics and many other subjects. She died of a heart attack. I think of her every day. I love to think about all the fun we had together since I can remember, with memories going back to when I was 9 months old. She taught me so many things for which I am grateful. A love of music was but one thing my mom taught me.
You might need a breather before you take up the guitar, but playing the guitar may help down the road. It helps to talk to someone close to you.
I lost my brother to Dementia, April of this year. Bill was 20 months younger then me.
We have to try to do our best while we are able to do so. Take it easy, and think good thoughts. That would make your mom happy!
Tom